- Updated for January 2025
- Based on 2025 ID commercial driver's license manual
Free Idaho CDL Air Brakes Test 2025
Your knowledge of air brakes will be thoroughly tested by anwering these review questions, which will bring you one step close to a CDL that allows you drive vehicles with air brakes in the state of Idaho. These 30 multiple-choice quetions, which closely resemble the types of questions you will find on your DMV exam, are based on information from the Idaho Commercial Driver’s License Manual. Study and practice as often as necessary to achieve the score that you want, and to become a safer driver. The explanation included with each question will also help with this process. Keep practicing, and good luck!
- Perfect for first-time and renewal CDL/CLP applicants, and those adding endorsements
- Triple-checked for accuracy
What you need to know
What to expect on the actual ID DMV exam
questions
correct answers to pass
passing score
Helpful links
List of questions (classic view)
- When should you drain your air tanks?
- The tractor protection valve
- Under which conditions are front wheel brakes good?
- The purpose of a supply pressure gauge is
- Which of the following is NOT part of the air brake system?
- At what measurement is the safety valve USUALLY set to open?
- What is the best way to test if your vehicle's spring brakes come on automatically?
- Why must you study air brakes in the state of Idaho?
- Which of the following is NOT part of the drum brake?
- How can you tell if your vehicle is equipped with an anti-lock braking system (ABS)?
- Which of the following should you do before leaving your vehicle unattended?
- Which vehicles must have low air pressure warning signals?
- How do brakes work on a long, steep downgrade?
- Which of the following is NOT part of the braking process when driving a tractor-trailer combination vehicle with an anti-lock braking system (ABS)?
- What is the best way to test your vehicle's low air pressure warning signal?
- When should you use the parking brake?
- Which of the following are true about a dual air brake system?
- Which of the following will be true about your brake function if your anti-lock braking system (ABS) fails?
- If the air tanks are not drained,
- An anti-lock braking system (ABS)
- How would you check your truck's slack adjusters?
- After the initial drop, the maximum acceptable leakage rates per minute are
- Slack adjusters are
- Spring brakes are
- Which of the following can cause brakes to fail or fade?
- The low air pressure warning signal will come on before the pressure in the air tanks falls below
- A low pressure warning signal is required on
- All vehicles equipped with air brakes have
- With air brake-equipped vehicles, the parking brakes should be used
- The use of air brakes on a downgrade is only a supplement to the
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